Effect of Mo and Mo-Ca substitution on the superconductivity of GdBa2Cu3O7−δ

Applied Superconductivity Pub Date : 1998-07-01 DOI:10.1016/S0964-1807(98)00121-5

Amish G. Joshi, M.V. Subbarao, Shah Nikesh A, D.G. Kuberkar, R.G. Kulkarni

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引用次数: 3

Abstract

The structural and superconducting properties of (Gd_1−yCa_y)Ba₂(Cu_1−xMo_x)₃O_z samples are investigated using X-ray diffraction, A.C. susceptibility, electrical resistivity and oxygen content measurements. The effect of increasing the Mo concentration in GdBa₂(Cu_1−xMo_x)₃O_z changes the structure from orthorhombic to tetragonal, accompanied by an increase in the normal state resistivity and decreases both the oxygen content and T_c, which is attributed to hole filling by Mo. This suppression in T_c has been compensated for by appropriate hole doping with Ca, for instance in the oxide (Gd_1−yCa_y)Ba₂(Cu_0.92Mo_0.08)₃O_z, the T_c increases from 27 K (y=0.0) to 86.5 K (y=0.24, compensated oxide), closer to the value of 91 K for pure GdBa₂Cu₃O_7−δ due to the balance between the hole filling by Mo and hole doping by Ca.

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Mo和Mo- ca取代对GdBa2Cu3O7−δ超导性的影响

采用x射线衍射、交流磁化率、电阻率和氧含量测定等方法研究了(Gd1−yCay)Ba2(Cu1−xMox)3Oz样品的结构和超导性能。在GdBa2(Cu1−xMox)3Oz中，Mo浓度的增加使结构由正交向四边形转变，同时伴随着Mo的空穴填充，使氧含量和Tc含量降低。这种抑制作用可以通过适当的空穴掺杂Ca来补偿，例如在氧化物(Gd1−yCay)Ba2(Cu0.92Mo0.08)3Oz中，Tc从27 K (y=0.0)增加到86.5 K (y=0.24，补偿氧化物)。纯GdBa2Cu3O7−δ接近91 K，这是由于Mo填充空穴和Ca掺杂空穴之间的平衡。

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Applied Superconductivity

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